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It is shown that if a well-defined nuclear spin-wave spectrum exists in a ferro- or antiferromagnet, the NMR linewidth is considerably narrower than would be calculated from the second moment 〈 Δ ω 2 〉 due to the Suhl-Nakamura interaction. We argue that if the frequency pulling ω c is large compared to 〈 Δ ω 2 〉 1 2 , only a small band of nearly degenerate modes can interact; so the situation is analogous to standard transition-probability calculations. This explains why the observed NMR linewidth in RbMn F 3 is an order of magnitude smaller than 〈 Δ ω 2 〉 1 2 . Nuclear spin-wave relaxation rates are calculated for RbMn F 3 . For zero wave vector the rate is 1.5 × 10 3 sec - 1 at 4.2°K in a field of 3000 Oe. This figure is much less than the NMR width, but is in close agreement with parallel-pumping data. It is suggested that the NMR width may be due largely to random inhomogeneities.
Physical Review – American Physical Society (APS)
Published: Sep 10, 1968
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